The __________ threshold is the smallest amount of energy needed for a person to detect the presence of a stimulus 50% of the time

Why would a group of preoperational children find magic tricks uninteresting?

A) Because they do not have the cognitive ability to make sense of the tricks. B) Because they understand that the tricks are fake. C) Because they don't understand natural laws. D) Because they are more attracted to activities that include movement.

__________ affects about 10 million U.S. adults, 80 percent of whom are women

A) Atherosclerosis B) Angina pectoris C) Osteoporosis D) Arterial thrombosis